Tell your local doctor your medical history, including: any allergies (especially to penicillin/cephalosporin antibiotics), bowel disease (colitis), kidney disease. Usage of the generic Cefdinir drug for prolonged or repeated periods may result in a secondary infection (e.g., oral, bladder or vaginal yeast infection). Tell your local doctor if you are pregnant before you buy Cefdinir. In a small test, it was not shown to be excreted into breast milk. However, other drugs related to it are excreted into breast milk. Consult your local doctor before breast-feeding.